Field-magnet structure.



No. 896,821. PATENTED AUG. 18, 1908 v H. G. REIST.

FIELD MAGNET S TRUOTURB. APPLICATION FILED APR,16,1902. RENEWED JUNE 12,1905.

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' No. 896,321 PATENTED AUG-18, 1908@ H. G. REIST.

' FIELD MAGNET STRUCTURE.

APPLICATION FILED APR. 16, 1902. RENEWED JUNE 12, 1905.

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v To all whom. it'may concern:

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NEW-YORK, ASSEGNOB To GENERAL 'stacrnic COMKANY, A CORPORATION OF'N EWYORK.

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Application filed 16, im, Eerie. E9. 103,101 Renewed June 12, 1905.

Bpecifi'cation of Letters Patent.

rel-n mes Aug. is, recs. Serial rim-acetic.

Be it known that I, Planar G. Rsrsr, a residing at Schen- Schenectady,Eitate of and useful Improvements in Field-Magnet Strucfollowing is aspecificaectady, county of tion;

This invention relates to the field-1nagnets of dynamo-electricmachines, and particularly to those in which the-field-magnet roarmatureremains stationary. In machines of thistype, particularly those adaptedto generate or utilize alternating currents, it is necessary orpreferable for the fieldmagnet structure to be laminated. It is a matterof extreme difiio'ulty to produce such a structure which wilhpermitremovable field- 7 magnet coils to be use and yet will be strong ancompact and capableof resisting centrifugal and other strains whenrotated at high cede- In the best form of my invention 1 use afield-magnet structure built up of lamina alternate circumferentialtongues and grooves, and the polepieces having alternate long and shortportions forming tongues and grooves which inrality of long and tudinalterlock with those of the body and are fastened thereto throughregistering slots in said interlocking tongues. The body herein shown isbuilt up of polygonal disk-shaped laminations grouped in units, eachunit being composed of a given number of laminations united together.The units are made in assembling a plurality of them on a shaft in'alternatesuccession, a body is formed having a polygonal suriacecontaining alternate circumferential tongues and grooves. 'lhepole-pieces are similarly composed of a plushort units alternately.arranged so as to form tongues and grooves which will interlock withthose of the body,

each unit being made of laminations riveted together. T he tongues havetransverse keywavs'slotted through. them to receive longiloclring keys.which fasten the polepieces to the body. The coils are held on thepole-pieces by U-sh pod clips whose ends have slots engaged by saidlongitudinal keys.

In the accompanying drawings, Figure 1' :"is an end view of aficldunagnet structure embodying my invention, showing only three bylongitudinal keys driven tivly in Figs. 8,9,10

two sizes, so that by in place; Fig. 2- is polepieces andcoils inalsectional elevation on the line 2 2,.

gitii Figs. 1 and 3; Fig. 3 is a topplan sectional.

view on the line 3 3, Fig. 2; 1g. 4 is an end view of one unit of thebody or central portion; Fig."5 is a sectional view of the same; Figs.'6 and 7 are'similar views of another body unit Fig. 8 is an endview andFig. 9 a section of one unit of the pole-pieces; Figs. 10 and 11 aresimilar views of another olepiece unit; Figs. 12, 13 andl l show moiiied constructions of pole-piece units; Fig. 15 is a pers xpole-precesto the body; Fig. 16 is top plan view of an end plate for apoleiece; and Fi 17 is a perspective view of t e clip for he ding thecoils on the pole-pieces.

The body of the fieldmagnet is composed of a plurality of alternatelylarge and small polygonal disk-shaped um'ts 1 2- having central o enings3 to fit on a driving-shaft. Each isk or unit is composed of a group ofsheet-metal laminations riveted together. When assembled, the disksconstitute polygonal. body whose faces are inadc up of alternatecircumferential tongues and grooves.

The pole-pieces are composed oi alternate long units 4 and short units5, shown rospecand 11. Each unit is made up of a grou of similarlamination-s riveted together. he plurality of long and short unitsconstitutinga pole-piece are 'lirmly secured together by rivets 6passing through all of them.

Instead of using separate long and short units, each unit may be builtup of long and short laminations grouped, as shown in Fig. 12 or Fig. 13or Fig. 14, and riveted together. A plurality of similar units, such asshown in any one of those figures, will produce a polepiece havingalternate tongues and grooves adapted to fit on a face of the bodyportion, and interlock with the tongues and grooves thereof. When a)olopiocc built up from any'oi the above ooscrlbed units is placed upona face of the body portion, the long units 4 enter the grooves and restupon the edges of the small. dislis 2, while the short units '5 rest onthe edge of the large disks 1-. Long keys or wedges 7 are then driventhrough registering slots 8 in the disks 1 and the long units 4, andfirmly secure the"polepieces in place.

a lonective view of a key for fastening the ion the latter are appliedto the ho The insulated field-coils 9, of a height totightly fill thespace between the pole shoulders and the edges of the larger core disks1, as shown in Fig. 1, are'wound on a form and slipped over the pole-)ieces before cly. To hold them securely, a U-shaped clip 10 is passeddown over each end of the coil, said cliphaving long ends which entertwo of the grooves in the body-portion and have slots .11 through whichthe long keys or Wedges 7 pass. .The clip is preferably made oflaminations riveted together. Between the top of the coil and the bi htof the clip I prefer to insert a fillin -blocl;12 having its middleportion 13 roun ed to fit the clip, and its ends 14 shouldered to engagetheedges of the clip and retain it in place. I

It will be seen that a field-magnet structure made as herein shown anddescribed is compact and solid, the coils are positively supported bothtop and bottom, and the entire structure has great strength to resistcentrifugal and torsional strains, besides being easily and quicklyassembled, or taken apart for repairs. Each pole-piece and its coil canbe removed without disturbing the others by merely knocking out the10ngitudi-. nal key which secures the clips and the polepiece.

What I claim as new and. desire to secure by Letters Patent of theUnited States, is-

l. A field magnet structure comprising a body made out of a pluralityof'units, each of said units consisting ofa number of laminae securedtogether.

2. A field-magnet structure composed of a plurality of and smalllaminated units.

3. A field-magnet structure having a body composed of a plurality'ofalternate large and small disks, each consisting of-laminations securedtogether.

4.. A field-magnet structure having a body composed of a pluralityofalternate large and small polygonal disks, each consisting oflaminations secured together.

5. A field magnet structure having a body composed of alternate largeand small polygonal units each comprising a plurality of having a bodyalternate large laminae riveted together, and means for securing'said-units in fixed relation.

6. "A field-magnet structure having a body composed of polygonallaminated units grouped to form alternate circumferential tongues andgrooves.

.i 7. A field-magnet structure having a body composed of laminated unitsgrouped to form circumferential tongues and grooves.

8; A field magnet stru ctu e comprising a pole piece made up of aplrality of units, each of said units consistingof a' number of lamina:secured together. i

9. A field-magnet pole-piece composed of a plurality of long and shortlaminated units.

10. A field-magnet pole-piece composed of a plurality of alternate longand short laminated units.

11. A field-magnet pole-piece composed of a plurality of alternate longand short units, each consisting of laminations secured together.

12. A field magnet structure comprising a body and pole pieces, eachmade up of a plurality of units, each of of a number of laminae securedtogether.

13. A field-magnet structure comprising a body and pole-pieces each madeup of a plurality of laminated units, with interlocking portions.

14. field-magnet structure comprisin a body and a polepiece each made upof a urality of laminated units, and having a ternating interlockingtonguesf 15. A field magnet structure comprising a body and a pole-pieceeach made up of a plurality of laminated units of different sizes andthicknesses whereby said parts are adapted to interlock with clearance.

16. A field-magnet structure comprisin a body and a pole-piece each madeup of a plurality of laminated units having alternating interlockingtongues, and a locking key passing through said tongues. 17. Afield-magnet structure comprising a body having grooves, a poleiece, acoil on said pole-piece, clips on sai coil entering said grooves, andmeans for fastening said clips to said body.

18. A-field-magnet structure comprising a body havin circumferentialgrooves, a polepiece, a coi on said pole-piece, a U-shaped cli-p passingdown over the end of said coil into said grooves, and means forfastening said oh to said body.

body having circumferential tongues and grooves and a' keyway slottedtransversely through said tongues, a tongues entering between thebody-tongues, a coil on said poleiece, a U-shaped clip passing downovert e end of said coil into two of said grooves, and a key passingthrough the tongues and clip.

20. A field-magnet structure consisting of a bod composed of alternatelarge and small aminated units, ole-pieces consisting of alternate longand siort laminated units on said pole-pieces, U-shaped laminated intosaid body, and longitudinal keysdriven through slots in the interlockingbody and pole-piece'units and the ends of the clips.

21. A field magnet structure comprising a body formed with grooves orrecesses, a pole piece carried by said body, a coil on said pole piece,coil. retaining clips entering said grooves or recesses for fasteningsaid clips to said body.

said units :9ns1sting pole-piece having clips passing over'the ends or"said coils and and interlocking with the body-units, coils 22. Afieldmagnet strueture eomprising a body formed with grooves or recesses, apole piece carried by said body, a coil on said pole piece, U-shapedcoil retaining clips the ends of which enter said grooves or recesses,and

- means for fastening'said clips to said body.

23. In combination, a laminated bod formed with grooves or spaces, a)010 piece carried thereby, a coil on said pole piece, a laminatedU-shaped coil retaining clip the ends of which enter said grooves orspaces, and means for securing said ends to said body.

24. A revoluble field-magnet structure having a laminated body portion,a plurality of laminated poles secured thereto each provided with anexciting eoil, means eonneeted to the. poles for holding the centralportions of the coils against centrifugal force, and means independentof the poles for holding the respective end portions'iof the coils,saidlindependent means being fastened to said l body portion. In witnesswhereof, I have hereunto set my hand this 14th day of April, 1902.

I HENRY G. REIST.

\Vitnesses:

BENJAMIN B. HULL, HELEN ()RFORI).

